Sound-deadening device



Filed Aug 26. 192'? Patented Aug. 26, 1930 UNITED STATES.

PATENT OFFICE FRED D. HOLDSWORTH, OF CLAREMONT, NEW HAMPSHIRE, .ASSIGNORT SULIIIIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTSSOUND-'DEADENING DEVICE Application filed August 26, 1927. Serial No.215,728.

This invention relates to sound deadening devices, and more particularlyto mufflers for internal combustion engines.

An object of my invention is to provide an improved sound deadeningdevice. An-

other object of my invention is to. prov de an improved mufiler forinternal combust on engines. A more specific object is to provide animproved muliler for use on internal combustion engines constituting theprime movers for portable compressors or other engines in which acomparatively low point of discharge for the combustion products isdesirable for any reason. Other objects and advantages of the inventionwill subsequently appear.

In the accompanying drawings I have shown for purposes of illustrationone form which my invention may assume in practice.

In these drawings,- 1

of Fig. 2.

Fig. 2 is a plan view of'the lower member of the muffler.

Fig. 3 is a perspective view of a complete muflier in position upon anexhaust pipe.

Fig. 4 is a. fragmentary vertical section one plane corresponding to theline 4-4 1 of Fig. 2. Referring to Fig. 3 of the accompanying drawings,the mufiler constituting the illus trative embodiment of my invention isgenerally designated 1 and is mounted upon the upper end of a dischargepipe 2. The mufller 1 comprises upper and lower members 3 and 4respectively which together enclose a chamber 5 into which the upper endof the pipe 2 opens. The up er member 3 is convex upon its outer sur aceand concave upon its inner surface and is provided with a de endingannular flange 6 extending comp etely around its periphery and with aseries of, herein three, lugs 7 which are adapted to cooperate with aportion of the lower memher 4 to space the members so as to provide anarrow, substantially annular, restricted vent through which theproducts of combus- 'tion may discharge-from the chamber 5. The lowermember 4 has a depending central portion 9 in which a threaded opening10 is ar- Fig. 1 is a vertical section on the line 1-1' ranged topermita threaded connection with the exhaust pipe 2. The walls of thecentral depending portion flare upwardly and at their top merge intogenerally radially extending walls 11 which form a surface slightlyconical instead of plane. The lugs 7 are adapted to engage the uppersurface of the flange 11 adjacent the periphery of the latter. At itsouter edge the flange 11 carries, in turn, a'depending flange 12 whichterminates at its lower edge in a sharply upturned rim 13. The flange 12at several points. herein three, about its periphery is provided withintegral lugs 14 to cooperate with the depending flange on the member 3and center the parts properly. Bolts 15 provided with nuts 16 extendthrough openings 17, 18 in bosses 19 and 20 respectively formed on theupper and lower members 3 and 4. The upturned rim 13 is provided withnarrow drain notches 21 at points in its periphery, three of thesenotches being shown herein, and these being arranged in the same radiallines with the lugs and bolts.

It will be evident that when the upper member 3 is superimposed upon thelower member 4, the lugs 7 will insure a narrow vent between theoutwardly converging walls of these members; and it will further benoted that the lugs 14 serve to center the parts, and that between theflanges 6 and 12 a further narrow vent passage is provided, the samebeing formed at a sharp angle to the vent passage first described. Itwill finally be evident that gases discharged through the twocircumferential vent passages heretofore described will engage the.

bottom of the groove formed by the upturned rim 13 and that these gaseswill be sharply reversed and directed upwardly. Any water 'which maycollect in the annular recess formed by the upturned rim 13 is free toescape through the notches 21.

From the foregoing description, it will be evident that I have providedan improved mufller having, by virtue of the initial chamber ofsubstantial volume into which the gases discharge and by virtue of thenarrow angularly disposed (Q1117 passages from this chamber, excellentsound deadening qualities and by virtue of the upward direction of theflange 13 the beneficial feature of directing the sheet of escapinggases upward instead of laterally ar l so Well away from any one workingor standing near the engine. It will further be noted that the positionof the drainage grooves opposite the lugs 7 and 1 and the bolts 15permits them to effect their draining function without causing anysubstantial radial discharge of exhaust gases.

While I have in this application specifically described one form whichmy invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as new anddesire to secure by Letters Patent is:

.1. In a muflier, a head member adapted for connection to an exhaustpipe and having a rebent flange terminating in a rim extendingsubstantially opposite to the direction of said flange, a cooperatinghead member having a flange adapted to surround said first mentionedflange and of smaller diameter than the-diameter of said rim, means forspacing said head members and flanges, means for holding them inassembled relation, and means for draining the space between said rimand first mentioned flange in common radial lines with said spacingmeans and holding means.

2. In a mufller, a head member adapted for connection to an exhaust pipeand having an annular portion disposed transversely of the axis of saidpipe, an outer annular portion extending back along the axis of saidpipe, and areversely directed peripheral flange, and a cooperating headmember disposed transversely of the end of said pipe and shaped todefine with said first mentioned head member a chamber graduallvdecreasing in height to its outer limits and continuing into aperipheral vent, said vent comprising portions extending generallyradially and portions extending substantially parallel to the axis ofsaid pipe, said reversely directed peripheral flange serving to reversethe direction of flow of said gases as they emerge from said ventforming means.

3. In a muffler, a head member having a portion adapted for connectionto an exhaust pipe, an'annular portion of substantial radial dimensioncompared with the radius of the exhaust pipe disposed transversely ofthe axis of said pipe, and an outer annular portion extending back alongthe axis of said pipe, said transversely disposed annular portionconnecting said outer annular portion and said portion adapted forconnection to an exhaust pipe, a concave head member having an annularflange extending substantia ly parallel to said outer annular portionand spaced therefrom, and means for holding said head members inassembled relation.

4. In a mufller, a perforated member adapted for connection to anexhaust pipe, a cooperating concave closure member having an annularflange, and means for holding said perforated member and said closuremember in assembled relation, said perforated member having adjacent theperforation therein an outwardly extending annular portion and,connected to said annular portion, a second annular portion extendingback along the axis of the pipe, said annular flange on said concaveclosure member extending substantially parallel to said baelrwardlyextending annular portion of said perforated member and being spacedtherefrom, and said outwardly extending annular portion of saidperforated member being disposed transversely of the axis of said pipeand being of substantial extent in a direction radially or and comparedwith the radius of said pipe.

In testimony whereof I aflix my signature.

FRED D. HOLDSWORTH.

